Assessing Infection Risks from Accidental Contact in Public Spaces - Internal Medicine

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Possibility of transmission


Hello Doctor, I went to a convenience store around noon to buy something.
While I was in line to check out, a stranger suddenly pushed past me.
I tried to dodge him, but he still brushed against me with the straw from his drink bottle (it seemed like he wanted to hand it to the clerk).
Since his straw might have had saliva on it, I noticed a slight red scratch (although it didn't appear to be bleeding, it looked red at the time).
Afterward, I went to the restroom to wash my hands and spray some alcohol.
However, I'm unsure if this situation could lead to an infection or if I could be at risk for diseases like HIV or Hepatitis B, since I remember that these are bloodborne infections, but saliva also seems like a bodily fluid.
I'm wondering if I need to go to the hospital for a check-up (I read online that it's better to wait three months for accurate testing, is that correct?).
I wanted to ask for your advice, or if I should not worry too much and perhaps not need to get checked.
Thank you! The area I marked in the picture was where I was scratched; it was initially a slight red mark, but it seemed to disappear after washing my hands.

Lina, 20~29 year old female. Ask Date: 2022/07/12

Dr. Hong Yuanbin reply Internal Medicine


Hello, based on your description and the images provided, there are no obvious wounds, so there is essentially no risk of infection.
Please don't worry, and thank you for your inquiry.

Reply Date: 2022/07/12

More Info


When assessing the risk of infection from accidental contact in public spaces, it's important to understand the modes of transmission for various pathogens, particularly those that cause serious diseases like HIV and Hepatitis B. Based on your description of the incident at the convenience store, let's break down the potential risks and provide some guidance.

Firstly, HIV (Human Immunodeficiency Virus) is primarily transmitted through direct contact with infected bodily fluids such as blood, semen, vaginal fluids, and breast milk. The virus does not survive long outside the human body and is not transmitted through casual contact, saliva, or surfaces. In your case, the contact with the straw, which may have had saliva on it, does not pose a significant risk for HIV transmission. The presence of a minor scratch or redness on your skin does not equate to an open wound that would facilitate the entry of the virus into your bloodstream, especially if there was no bleeding involved.

Similarly, Hepatitis B is transmitted through contact with infected bodily fluids, particularly blood. While saliva can contain the virus, the risk of transmission through saliva alone is extremely low, especially in the context of a brief contact with a straw. The likelihood of contracting Hepatitis B from such an incident is minimal, particularly if you have intact skin and no significant open wounds.

In terms of immediate actions, washing your hands and using alcohol-based sanitizer after the incident was a prudent step. This helps reduce the risk of any potential pathogens that may have been present on surfaces or objects you touched. It is also important to note that the redness you observed may have been a minor irritation rather than a sign of a serious injury.

Regarding your concern about needing to go to a hospital or getting tested, it is generally not necessary in this situation. If you do not develop any symptoms or if the redness subsides, there is no need for further action. However, if you experience unusual symptoms such as fever, fatigue, or any signs of infection in the following weeks, it would be wise to consult a healthcare professional.

For peace of mind, if you are still concerned about potential exposure to bloodborne pathogens, you can consider discussing your situation with a healthcare provider. They can provide personalized advice based on your medical history and the specifics of the incident. Testing for HIV and Hepatitis B typically involves a blood test, and while HIV tests can be done at various intervals (with the most accurate results usually obtained after three months), it is essential to follow up with a healthcare provider for guidance on the appropriate timing for testing based on your risk factors.

In summary, while it is natural to feel anxious after an unexpected encounter, the risk of infection from the incident you described is very low. Maintaining good hygiene practices, such as washing your hands regularly and avoiding contact with potentially contaminated objects, will further reduce your risk of infection in public spaces. If you have ongoing concerns, seeking professional medical advice is always a good step.

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